Photographic material



- Nov. 9, 1937. W. SCHNEIDER l-:r AL I 2,098,891

PHOTOGRAPHIC MATERIAL Filed NOV. 16, 1954 lllllllll/l1lll/11111lill/11111,IlllIIIIIIIIIIl/ll/llllllll '11111111111l,,111l1111111ll/111,11Ill/11111111111llllllllnvn Patented Nov. 9.,

UNITED STAT PATENT oFFlcE rnoToGnAPnIc MATERIAL Wilhelm Schneider, Dessau in Anhalt, and Gustav Wilmanns, Wolfen Kreis Bitterfeld, Germany, assignors to Agia Ansco Corporation,

Binghamton, N. York Y., a corporation of New i Application N'Qvembei- 16, 1934, serial No. 753,390 In Germany November` 18, 1933 4 Claims.

Our present invention relates to the manufacture of anti-halation layers or filter layers.

f One of its objects is to provide an ii'nprovedA anti-halation or filter layer.

Further. objects '5 will be seen from the detailed specication fol- (application I. 48,335 IVe/22h). These dyestuis lowing hereafter.

Reference is made to the accompandngdrawing in which AFigs. and 2 show a photographic plate or film provided with an anti-halation layer, and Fig.

3 shows a photographic plate or film provided 1 with a filter layer.

The tripnenylmethane dye'stuifs hitherto used for dyeing colloid layers intended to serve as antihalation layers or iilter layers suier from great disadvantages; either they cannot be decolorized completely at the beginning of the treatment in -the treating bathsor they are reformed during the process of drying in' the air. Most dyestus of this series and more particularlythose which have no `sulfonic acid groups suffer from the further disadvantage of a tendency to fogging or of 'an adverse effect on the 4sensitivity when they comeP into contact withfthe photographic layer. Both -properties render them unsuitable for use for photographic purposes.-

By this invention these disadvantages are avoided by'dyeing colloid layers of thekindin question with dyestuffs of the' triphenylmethane A series in which one or more sulfallq/l groups are introduced into the dyestuil. The manufacture is carried out as described in German patenthave the advantage that they are decolorized very easily and completely in developers and alsov washed outb of the gelatine. Consequently there is no fear1 of the color returning during the operation of drying in the air. Moreover, the

dyestuffs do not' have the very adverse effects on the emulsion which are associated with the use of triphenylmethane dyestuis that are not A thussubsmud.

The following examples illustrate the invention:

V Emmi-bie 1.-A gr' 'n anti-halation layer is to grams of gelatin.

Example 2.-In like manner a green` anti-halation layer is obtained by adding to gelatin .a dye- 20 stui of the following constitution:

f CH: CH3 CHx. CHi

CHzSOaNB 35 CHiSoa y Y Any other substance of colloidal character may, of course, be used instead of the gelatin.

Figs. 1, 2, andA 3, which show an anti-halation 40 layeror a filter layer on a photographic film or plate are believed to be self explanatory.

' What we claim is: f' 1. A photographic material comprising attached to each other a support, a light-sensitive emulsion layer and a layer comprising a colloid and al di-p'-dialkylaminotriphenylmethane dye f containing at least one alkyl-o-sulfonicacid group directly linked to the third phenyl group.

2. A photographic .material lcomprising ati- 50 attached to each other.

tached to `each other a support, a iight-sensitive emulsion layer and a layer comprising gela tin and a di-pdialkylaminotriphenylmethane dye containing at least onealkyl-w-sulfonic acid group directly linked to the third phenyl group.

3. A photographic material comprising a'support, a light-sensitive emulsion layer and a layer comprising gelatin and a dye corresponding with the formula CH3 CHE i i. O

CH3 CH3 CHzCHzSO;

4. A photographic material comprising a support, a light-sensitive emulsion layer anda layer comprising gelatin` and a dye corresponding with the formula CH: CHI

CH3 CH:

CHzSO:

CIhSOaNa attached to each other.

WILHELM SCHNEIDER. GUs'rAv WILMANNS. 

